AU YEUNG WAI-LAN (Yuen Qiu), owner of a martial arts training school, is reunited with her long-lost son KOO YU-CHEUNG (Kevin Cheng) after years of agonizing separation. On his return home, CHEUNG is shocked to find that his younger brother KOO YU-TONG (Ma Kwok Ming) has been critically ill and that his father was murdered long ago by WING TAK (Lam Ka Wah), the existing director of a pharmaceutical company and a bitter old foe of the KOOs. 經營武館的歐陽惠蘭(元秋)幾經轉折與失散多年的大兒子 顧汝章(鄭嘉穎)團聚，汝章回家後才得知二弟顧汝棠(馬國明)身患重疾，父親被藥廠老闆榮德(林嘉華)加害，與榮家早成世仇。汝章本無心學武，但一次遇上 榮德跋扈囂張的兒子榮萬鈞(向佐)而大打出手，才讓大家發現汝章是可造之材，母親祈望兒子為武館重振雄風，遂向汝章傳授獨門武功，又為他報名參加廣東省拳 王大賽。想不到決賽對手正是世仇之子…… 汝章自習武後得意忘形，迷失心性；在感情方面，則糾纏於師妹應雁鳴(唐詩詠)及心上人周冰冰(胡定欣)的三角關係中，結果在拳王總決賽的擂台上不堪一擊